"It's obvious when you look at the squad that we feel there is a need to strengthen the team, but we don't want to throw our players under the bus saying that they are not good," Nabi told journalists.
"No, they are good, today they are in our squad, they are in our team but every transfer window we will take the opportunity to try to strengthen the team.
"The club is working hard to find the best opportunities that are possible and we hope that everything can improve our squad. We don't feel that the [new] striker can resolve all the issues that we have been having in the final third," he added.
"The first thing is for every player to step up, to be more calm when we get into those situations to make better decisions and make more movement to support the play. The striker can give more opportunities and something more, but he can't resolve everything."